The ZX300 is a good subject for this thread as driving the IER-Z1R off an Apple dongle is a good subject. Due to the IER-Z1R personality, if a person likes the tone from a phone, getting a better source just makes things better. Rutter: I understand you. I totally understand what your saying. I’ve been around (11 years) and personally I’ve purchased $2000 flagships where folks were in tears about how they sounded, but I was like “meh”? I understand what your going through. Basically there are different audiophiles. There are the ones that like thinner faster low end; think HD800 sounding lows. These audiophiles are just as correct as the folks who gravitate towards more bass heavy signatures. Though you should do the both finger pressing test of pushing and holding the IER-Z1Rs in place farther in. If you push them around, basically any direction and the sound does not change you have reached optimal fit and tips. This is important here as somehow with this IEM inner-inside fit is important for the DD super tweeter. The Sony sound IS not for everyone. I would try the Noble Encore or the Noble Khan. Try a thinner sounding more mid-centric signature as that may be your home. The thing is this IER-Z1R signature is in many ways a departure from the more bass response of the XBA-N3....the Z5, the Z7 and the full-size Z1R. It’s just that it’s still the Sony house sound. There may be an acclimation for you later on, but it would take a month. Literally an attempt of using the IEMs only as your only IEMs to see if your perception of “correct” could somehow switch-over. But there is a pretty good chance, like 80% that you know your sound preferences already and the IER-Z1R may not be meant for you. The choice of music here is irrelevant, as for folks into the IER-Z1R that aspect does not matter, for them they do it all. Next the ZX300. Regardless you should be not on low gain but high gain. High gain is going to increase damping factor and get this bass issue out of the woods......so to speak. Also what firmware are you on? Next you should try the 1A. Seriously try another source to try and confirm if it’s simply a bad combination for you. What I’m trying to say this stuff is exactly like car seat adjustment. If the seat is out of place you can be uncomfortable. A long drive.......fricking mental! Make a small car seat adjustment, which could be fit? It could be the DAP. Because your on low gain with the warmest DAP complaining about basically “warmth”...... Lol. When the car seat is in place, you can function and take in the sights (music) because your not thinking about your position. Cheers! Good luck. Edit: Right....there is no absolute right or wrong here. Everyone becomes correct when they find their own personal sound signature. It’s like the temperature of coffee, some want hot, others not so much. This is not a question of good taste or bad taste. But the important thing is understanding your personal wants and needs. Some of the time it’s a really small change like a different DAP, or even something as little as a different cable replacement. It’s wild!!